<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box {
      width: 200px;
      height: 200px;
      border: 1px solid #000;

      background: url("./images/girl.png");
      /* background-size: 100%; */ 
      /* background-size: 30%; */
      /* background-size:100px 100px; */
      /* background-size: cover; */
      background-size: contain;
      background-repeat: no-repeat;
    }
  </style>
</head>

<body>

  <div class="box"></div>

</body>

</html>